EP0789510A1 - Wettable powder formulations - Google Patents
Wettable powder formulationsInfo
- Publication number
- EP0789510A1 EP0789510A1 EP95935768A EP95935768A EP0789510A1 EP 0789510 A1 EP0789510 A1 EP 0789510A1 EP 95935768 A EP95935768 A EP 95935768A EP 95935768 A EP95935768 A EP 95935768A EP 0789510 A1 EP0789510 A1 EP 0789510A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- powder formulation
- formulation according
- powder
- biocide
- post
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/12—Powders or granules
- A01N25/14—Powders or granules wettable
Definitions
- This invention relates to wettable powder formulations, and in particular it relates to wettable powder formulations of biocides which require an adjuvant to enhance their efficacy.
- a most important class of these biocides are the post- emergent foliar herbicides which are used to control weeds or other undesirable plants in, for example, a crop. Many such herbicides are relatively ineffective in the absence of an adjuvant to augment their performance.
- Adjuvants are also used to enhance the activity of insecticides and fungicides where it is necessary for such biocides to be transported through the waxy layer of the cuticle of the foliage of a plant in order to be effective.
- the present invention relates to wettable powder formulations of these insecticides and fungicides, as well as to the formulations of herbicides, in particular post-emergent herbicides.
- liquid formulations of herbicides or pesticides such as emulsifiable concentrates (ECs) and suspension concentrates may be applied as a fine spray after being added to tank water.
- ECs emulsifiable concentrates
- suspension concentrates emulsifiable concentrates
- the emulsions formed must disperse such that particular entities in the spray water do not cause blockages in the filters and nozzles of the spraying equipment.
- problems of toxicity and inconvenience in practical use are associated with these formulations; including: the escape of volatile solvents to the environment • problems of safe disposal
- the present invention provides a process for the preparation of wettable powder formulations of biocides which require an adjuvant for foliar wetting or penetration, wherein the powder formulations have similar efficacy to the standard commercial EC of the same active ingredient. Moreover, the powder formulations of this invention do not require added crop oil or adjuvant to achieve efficacy.
- Certain classes of post-emergent herbicides which must be applied to the leaves of the target plants are usually supplied as emulsifiable concentrates for addition to water immediately before application by spraying onto the target plants.
- a class of herbicide with specific foliar post-emergent application is the aryloxy-phenoxy-propionate class, or "fops".
- herbicides in this class have generally been formulated as emulsifiable concentrates incorporating a crop oil and/or surfactant adjuvant, with the adjuvant being added to enhance efficiency in the control of targeted weeds.
- clodinafop has not been successfully formulated as a powder because the herbicide (and/or safener where present) degrades in storage. Furthermore, solvent residues can be unacceptable, and the efficiency of release of the herbicide from the powder formulation is often also unacceptable.
- WO 95/18531 International Patent Application No. PCT/IB95/00001 in the name of Ciba-Geigy AG discloses a wettable powder formulation comprising at least one herbicide, at least one porous solid carrier material and a nonionic surfactant, which is prepared by mixing the various components together.
- th wettable powder formulations of the present invention are characterised by th use of an adjuvant system which is both a solvent and adjuvant for the activ component, and which provides effective release or dumping of the biocide fro the wettable powder formulation when it is added to water. These formulation are prepared by first dissolving the active component in the adjuvant system an then absorbing the solution into a carrier powder.
- a wettable powde formulation which comprises an internally porous carrier powder having minimum internal pore volume of 20%, said carrier powder having incorporate therein a solution of a biocide in an effective adjuvant system, wherein th adjuvant system is an effective solvent and adjuvant for the biocide, and provide effective release of the biocide from the wettable powder formulation when it i added to water.
- the biocide which comprises the active component of the powde formulation of this invention may be any post-emergent herbicide or othe herbicide, insecticide or fungicide which requires an adjuvant to enhance it efficacy and which is soluble in the adjuvant system.
- active components are the aryloxy phenoxy-propionate ("fop") herbicides, however the present invention als extends to powder formulations comprising other herbicides including by way o example the cyclohexanediones (or “dims”) and the diphenyl ethers, both of which are well known classes of post-emergent herbicides.
- frop aryloxy phenoxy-propionate
- the present invention als extends to powder formulations comprising other herbicides including by way o example the cyclohexanediones (or “dims”) and the diphenyl ethers, both of which are well known classes of post-emergent herbicides.
- the adjuvant system forms a stable solution of the biocide, that is a solution in which a sufficient quantity of the biocide is dissolved in the solvent without crystallisation or degradation.
- the adjuvant system forms an effective adjuvant system for enhancing the activity of the biocide, for example, when the biocide is a post-emergent herbicide, in crop protection.
- the wettable powder formulation of this invention is added to water with stirring, the biocide is released or dumped from the carrier powder in the form of an emulsion comprising small or even microscopic droplets without formation of crystals which are large enough to block spray equipment.
- a particularly preferred adjuvant system for use in accordance with the present invention comprises at least one, essentially non-ionic alkylene oxide or organosilane surfactant. It is noted, however, that other non-ionic or ionic surfactants may be included in effective adjuvant systems in accordance with this invention in combination with one or more essentially non-ionic alkylene oxide or organosilane surfactant.
- Suitable effective adjuvant systems for use in accordance with this invention may be readily identified by testing candidate surfactants or surfactant or surfactant-containing mixtures for activity as an adjuvant and solvent for the particular biocide to ensure that a stable solution is formed, testing that when the solution of biocide is added to water it readily forms an emulsion without formation of large crystals of biocide or adjuvant in the water, and then testing the resultant solutions after being added to the carrier powder to ensure effective release or dumping of the biocide when the powder formulation is added to water.
- the adjuvant system preferably is capable of dissolving the herbicide in the ratio of 1 part herbicide :
- adjuvant system 1 to 4 parts adjuvant system to form a stable solution. If desired, or necessary, an additional, non-adjuvant co-solvent may also be included in the adjuvant system in order to improve solvency of the herbicide or to decrease costs.
- Preferred wettable powder formulations of post-emergent herbicides such as clodinafop in accordance with this invention are storage stable.
- storage-stable when used herein means that after a sample of the powder formulation has been kept for 14 days at 35°C, preferably 14 days at 54°C, the active therein (that is the herbicide and/or safener) has not significantly degrade as measured analytically.
- the wettable powder formulatio of this invention preferably also comprises a safener for the herbicide which i capable of dissolving in the adjuvant system. More preferably, the safener i capable of being dissolved in the adjuvant system in the ratio of 1 part safener: to 16 parts adjuvant system.
- the wettable powder formulation of this invention may als comprise one or more dispersants and/or wetting agents to assist in dispersio of the powder and in the formation of a stable emulsion when the powde formulation is dispersed into spray water.
- the herbicidally active wettable powder formulation o this invention preferably has a herbicidal activity comparable to the product "Topik 80" (manufactured by Ciba-Geigy Limited), a commercial EC containing 8% clodinafop and 2% cloquintocet, or the product Topic 240 (manufactured by Giba- Geigy Limited) plus 1% DC Trate (a crop oil product manufactured by Ampol).
- Preferred fop herbicides for the incorporation into the wettable powder formulations of this invention are clodinafop, and quizalofop-p-tefuryl.
- the most preferred herbicidalformulation comprises 2-propynyl (R)-2-[4-(5-chloro-3-fluoro-2- pyridinyloxy)-phenoxy]-propionate or clodinafop (manufactured by Ciba-Geigy Limited).
- Another preferred post-emergent herbicide is the diphenylether oxyfluorfen.
- the internally porous carrier powder of the formulation of this invention is preferably hydrophilic, and may comprise either porous particles or porous aggregates of discrete particles, for example, porous silica particles or precipitated silica aggregates, diatomaceous earth, precipitated calcium silicate, or the like.
- the powder has a mean particle size in the 10-20 micron diameter range.
- the powder particles are such as to leave nil residue on a 45 micron sieve.
- Typical carrier powders which can be used in the formulations of the present invention are:
- Hi-Sil 257 a synthetic, amorphous, hydrated silica produced by PPG Industries Taiwan Ltd.;
- Hi-Sil HOA also a synthetic, amorphous, hydrated silica produced by PPG Industries Taiwan Ltd.
- Sipernat 50S a ground, spray-dried, hydrated silica, manufactured by Degussa.
- Huber 600 a synthetic calcium silicate, manufactured by Huber Corporation.
- the essentially non-ionic alkylene oxide surfactants which are the preferred adjuvant systems in formulations of the present invention are preferably ethylene oxide adducts; more preferably, the surfactant is an ethylene oxide adduct containing at least one mole of propylene oxide.
- Suitable surfactants include the nonionic surfactants described in International Patent Publication No. WO 95/18531.
- Typical essentially non-ionic surfactants are biodegradable alkylene oxide adducts selected from the group consisting of alcohol alkoxylates such as "BS1000” and 'Teric 164", polyalkylene oxide adducts of synthetic alcohols such as 'Teric BL8" and 'Teric BL9” (commercially available in Australia under the above designations from ICI Australia), and Anterox B0327 (manufactured by Rhone-Poulenc).
- the adjuvant system may also comprise a combination of an essentially non-ionic alkylene oxide surfactant as described above with another surfactant, for example another non-ionic surfactant.
- a preferred dispersant is the sodium salt of N-methyl-N-oleoyltaurat available commercially under the trade name "Hostapon T" (manufactured b Hoechst).
- Particularly preferred powder formulations of the present inventio comprise the following, by weight:
- an amount by weight of cloquintocet safener equivalent to about 25 of the clodinafop is preferably added.
- the present invention also provides a process o preparing the wettable powder formulation of this invention which comprises the steps of dissolving the biocide in the effective adjuvant system as defined above, and then incorporating the solution in the internally porous earner powder by intimate mixing. Optionally, a dispersant and/or wetting agent is then added.
- the biocide is a post-emergent herbicide and a safener is used, the safener is dissolved with the herbicide in the adjuvant system.
- the biocide (and optional safener) and the adjuvant system form a genuine solution at the working concentrations of the biocide prior to combination with the carrier powder.
- this solution will be stable (that is, non-crystallising) in the presence of the carrier powder at ambient storage temperatures.
- clodinafop it is preferred to use a temperature of between 50°C and 60°C.
- the major advantage of this formulation is that the active ingredient is rapidly, effectively, and maximally released when the formulation is dispersed in water. Consequently the formulation displays superior biological activity.
- This invention also extends to an aqueous dispersion of a wettable powder formulation as broadly described above.
- this invention provides a method of administering a biocide at a locus, which comprises:
- the present invention provides a method for post- emergent herbicidal treatment of target weeds in a crop, which comprises:
- the powde formulations of the present invention can provide storage-stability as well as safety and ease of application in the field through packaging of the ensuing wettable powder formulations in water-soluble bags.
- Plastic pots 10 cm in diameter were filled with Debco potting mix (AS 3743). Two seeds of the test species (Avena sativa) were sown 15 mm below the surface. Pots were placed in a glasshouse at 28-30°C during the day and 13- 15°C at night, and maintained at an adequate moisture content. After emergence, the plants were thinned for uniformity to 1 seedling/pot. Plants were re-selected for uniformity at the 2A to 3 leaf stage. Plants were sprayed in a laboratory track sprayer and returned to the glasshouse.
- Avena sativa Two seeds of the test species (Avena sativa) were sown 15 mm below the surface. Pots were placed in a glasshouse at 28-30°C during the day and 13- 15°C at night, and maintained at an adequate moisture content. After emergence, the plants were thinned for uniformity to 1 seedling/pot. Plants were re-selected for uniformity at the 2A to 3 leaf stage. Plants were
- Herbicide formulations were evaluated using a dose response bio-assay.
- Each treatment contains 10 herbicide rates, with each rate containing seven replicates.
- the calibrated track sprayer is fitted with 3 nozzles (Spraying systems®
- the herbicide for example, clodinafop, and its safener, cloquintocet
- the solution is then slowly added to stirred carrier powder and mixing continued, maintaining a minimum temperature of 20°C, preferably 50°C, until the solution is absorbed into the carrier powder.
- dispersant is added to the stirred mixture and mixing continued until it is uniformly incorporated.
- Each of the following Examples was prepared by first preparing a solution of all ingredients listed above the carrier, loading the solution thus obtained into the carrier, and then thoroughly mixing in the dispersant.
- Example 1 demonstrates the simplest form of the invention, in which the active ingredient is dissolved in a single adjuvant/solvent and loaded into a carrier powder. A dispersant is added to assist in the dispersion of the powder in the spray water.
- Example 1
- Pantera 6% EC was sprayed using "Uptake” (a recommended crop oil adjuvant, manufactured by Dow Elanco) at 0.5% on spray water.
- Example 1 was sprayed without added adjuvant.
- Adjuvant Teric BL9 (ICI) 39.5
- Topic 240 was sprayed using DC Trate (a recommended crop oil adjuvant manufactured by Ampol) at 1 % on spray water.
- Example 4 was sprayed without added adjuvant (see Figure 4).
- Example 6 The following two Examples demonstrate how the deficiencies of the type encountered in Example 5 can be overcome by the addition of a co-surfactant.
- Example 6 The following two Examples demonstrate how the deficiencies of the type encountered in Example 5 can be overcome by the addition of a co-surfactant.
- Adjuvant Anterox B0327 (Rhone-Poulenc) 40.3
- Example 5 shows how deficiencies of the type encountered in Example 5 can be overcome by using a blend of adjuvants.
- Adjuvant Teric BL8 (ICI) 49.5
- Teric 16M15 was found to be a good adjuvant when tank mixed with a commercial was found to be a good adjuvant when tank mixed with a commercial clodinafop EC (Topic 240, Ciba-Geigy).
- Figure 13 compares Topic 240 + DC Trate (a crop oil concentrate recommended by Ciba-Geigy, manufactured by Ampol) with Topic 240 + Teric 16M15 at three different rates. Although Teric 16M15 is shown to be an adjuvant, after two weeks at 54°C the active content of Example 13 had dropped from 12.7% to 5.6%. Thus, chemical stability of the solution must be considered.
- This Example uses a vegetable oil as the principal adjuvant. This Example demonstrates reductions in bioefficacy on storage when an inappropriate adjuvant is chosen. In a powder formulation, it is believed the vegetable oil tends to crosslink by reaction with oxygen, and once crosslinked no longer releases from the powder into the spray water.
- Figure 14a shows that Example 14 demonstrates similar bioefficacy to the standard Ciba-Geigy EC, Topic 80, when sprayed immediately after manufacture.
- Figure 14b shows a considerable decrease in efficacy for Example 14 relative to the Topic 80 after storage of the powder for a period of 9 days at ambient temperature.
- Hubersorb 600 is basic in nature and therefore can only be used with actives which are stable to alkaline hydrolysis. After two weeks storage at 54°C the active content of this Example had dropped from 11.2% to 6.4%.
- Figure 1 compares the activity (on Avena sativa) of (a) Pantera 6% EC + 0.5% Uptake on spray water with (b) powder formulation of Example 1.
- Figure 2 compares the activity (on Avena sativa) of (a) Topic 80 with (b) powder formulation of Example 2.
- Figure 3 compares the activity (on Avena sativa) of (a) Topic 80 with (b) powder formulation of Example 3.
- Figure 4 compares the activity (on Avena sativa) of (a) Topic 240 + 1 % DC
- Figure 5 compares the activity (on Avena sativa) of (a) Topic 80 with (b) powder formulation of Example 5.
- Figure 6 compares the activity (on Avena sativa) of (a) Topic 80 with (b) powder formulation of Example 6.
- Figure 7 compares the activity (on Avena sativa) of (a) Topic 80 with (b) powder formulation of Example 7.
- Figure 8 compares the activity (on Avena sativa) of (a) Topic 80 with (b) powder formulation of Example 8.
- Figure 9 compares the activity (on Avena sativa) of (a) Topic 80 with (b) powder formulation of Example 9.
- Figure 10 compares the activity (on Avena sativa) of (a) Goal + 0.25 BS1000 on spray water with (b) powder formulation of Example 10.
- Figure 11 compares the activity (on Avena sativa) of (a) Goal + 0.25 BS1000 on spray water with (b) powder formulation of Example 11.
- Figure 12 compares the activity (on Avena sativa) of (a) Goal + 0.25 BS1000 on spray water with (b) powder formulation of Example 12.
- Figure 13 compares the activity (on Avena sativa) of (a) Topic 240 + 1
- Figure 14a compares the activity (on Avena sativa) of (a) Topic 80 with (b) powder formulation of Example 14 sprayed immediately after manufacture..
- Figure 14b compares the activity (on Avena sativa) of (a) Topic 80 with (b) powder formulation of Example 14 sprayed nine days after manufacture.
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- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Pest Control & Pesticides (AREA)
- Plant Pathology (AREA)
- Agronomy & Crop Science (AREA)
- Engineering & Computer Science (AREA)
- Dentistry (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Environmental Sciences (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPM9267A AUPM926794A0 (en) | 1994-11-04 | 1994-11-04 | Herbicidal formulations |
AUPM9267/94 | 1994-11-04 | ||
AUPM926794 | 1994-11-04 | ||
PCT/AU1995/000728 WO1996013975A1 (en) | 1994-11-04 | 1995-11-02 | Wettable powder formulations |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0789510A1 true EP0789510A1 (en) | 1997-08-20 |
EP0789510A4 EP0789510A4 (en) | 2000-10-11 |
EP0789510B1 EP0789510B1 (en) | 2004-01-21 |
Family
ID=3783782
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95935768A Expired - Lifetime EP0789510B1 (en) | 1994-11-04 | 1995-11-02 | Wettable powder formulations |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0789510B1 (en) |
AR (1) | AR000076A1 (en) |
AT (1) | ATE258011T1 (en) |
AU (1) | AUPM926794A0 (en) |
DE (1) | DE69532476T2 (en) |
ES (1) | ES2215176T3 (en) |
WO (1) | WO1996013975A1 (en) |
ZA (1) | ZA959306B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2418283A1 (en) | 2010-08-07 | 2012-02-15 | Nomad Bioscience GmbH | Process of transfecting plants |
EP2584042A1 (en) | 2011-10-17 | 2013-04-24 | Nomad Bioscience GmbH | Production, storage and use of cell wall-degrading enzymes |
WO2014187571A1 (en) | 2013-05-23 | 2014-11-27 | Nomad Bioscience Gmbh | Process of providing plants with abiotic stress resistance |
WO2017025967A1 (en) | 2015-08-13 | 2017-02-16 | Forrest Innovations Ltd. | Formulations and compositions for delivery of nucleic acids to plant cells |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BRPI0416669B1 (en) * | 2003-11-17 | 2018-11-21 | Syngenta Participations Ag | emulsifiable concentrates containing adjuvants, pesticidal composition, and method for selective control of weeds in useful vegetable crops |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993014631A1 (en) * | 1992-01-24 | 1993-08-05 | Ici Australia Operations Proprietary Limited | Water dispersible granules of liquid pesticides |
WO1995004460A1 (en) * | 1993-08-11 | 1995-02-16 | Ishihara Sangyo Kaisha Ltd. | N-pyridyltoluidine-containing fungicidal water dispersible granules |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2661709B2 (en) * | 1988-07-08 | 1997-10-08 | ダウ・ケミカル日本株式会社 | Production method of highly active pesticide wettable powder |
AU619693B2 (en) * | 1989-08-02 | 1992-01-30 | Sumitomo Chemical Company, Limited | Water dispersible granules |
DE4120694A1 (en) * | 1990-08-24 | 1992-02-27 | Bayer Ag | SOLID FORMULATIONS |
FR2677849B1 (en) * | 1991-06-20 | 1995-06-16 | Francais Prod Ind Cfpi | PHYTOPHARMACEUTICAL WETABLE POWDERS AND THEIR PREPARATION METHOD. |
NZ263120A (en) * | 1993-03-19 | 1996-10-28 | Daratech Pty Ltd | Herbicidal composition; comprises trifluralin supported inside porous, finely divided carrier particles |
FR2713045B1 (en) * | 1993-12-03 | 1996-08-09 | Roussel Uclaf | Granules emulsifiable in water, their preparation process and their application as pesticides. |
-
1994
- 1994-11-04 AU AUPM9267A patent/AUPM926794A0/en not_active Abandoned
-
1995
- 1995-11-02 DE DE69532476T patent/DE69532476T2/en not_active Expired - Lifetime
- 1995-11-02 EP EP95935768A patent/EP0789510B1/en not_active Expired - Lifetime
- 1995-11-02 AT AT95935768T patent/ATE258011T1/en not_active IP Right Cessation
- 1995-11-02 WO PCT/AU1995/000728 patent/WO1996013975A1/en active IP Right Grant
- 1995-11-02 ES ES95935768T patent/ES2215176T3/en not_active Expired - Lifetime
- 1995-11-03 AR AR33411995A patent/AR000076A1/en unknown
- 1995-11-03 ZA ZA959306A patent/ZA959306B/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993014631A1 (en) * | 1992-01-24 | 1993-08-05 | Ici Australia Operations Proprietary Limited | Water dispersible granules of liquid pesticides |
WO1995004460A1 (en) * | 1993-08-11 | 1995-02-16 | Ishihara Sangyo Kaisha Ltd. | N-pyridyltoluidine-containing fungicidal water dispersible granules |
Non-Patent Citations (1)
Title |
---|
See also references of WO9613975A1 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2418283A1 (en) | 2010-08-07 | 2012-02-15 | Nomad Bioscience GmbH | Process of transfecting plants |
WO2012019660A1 (en) | 2010-08-07 | 2012-02-16 | Nomad Bioscience Gmbh | Process of transfecting plants |
EP2584042A1 (en) | 2011-10-17 | 2013-04-24 | Nomad Bioscience GmbH | Production, storage and use of cell wall-degrading enzymes |
WO2014187571A1 (en) | 2013-05-23 | 2014-11-27 | Nomad Bioscience Gmbh | Process of providing plants with abiotic stress resistance |
WO2017025967A1 (en) | 2015-08-13 | 2017-02-16 | Forrest Innovations Ltd. | Formulations and compositions for delivery of nucleic acids to plant cells |
Also Published As
Publication number | Publication date |
---|---|
ATE258011T1 (en) | 2004-02-15 |
AR000076A1 (en) | 1997-05-21 |
WO1996013975A1 (en) | 1996-05-17 |
EP0789510A4 (en) | 2000-10-11 |
DE69532476D1 (en) | 2004-02-26 |
EP0789510B1 (en) | 2004-01-21 |
DE69532476T2 (en) | 2004-11-04 |
ES2215176T3 (en) | 2004-10-01 |
AUPM926794A0 (en) | 1994-12-01 |
ZA959306B (en) | 1996-08-26 |
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